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Rafique, Rafia,Zahra, Zahra,Virk, Nasar,Shahid, Muhammad,Pinelli, Eric,Park, Tae Jung,Kallerhoff, Jean,Arshad, Muhammad Elsevier 2018 Agriculture, ecosystems & environment Vol.255 No.-
<P>Titanium dioxide nanoparticles (TiO2 NPs) are used widely in commercial products. These high production levels have led to their increased release into natural ecosystems, where they may interact with plants and affect their physiological functions. The aim of this study was to assess the physiological responses of wheat (Triticum aestivum L.) to increasing concentrations of TiO2 NPs. TiO2 NPs with a particle size less than 20 nm were administered as soil spiked with 0, 20, 40, 60, 80, and 100 mg TiO2 NPs kg(-1), and their physiological parameters, including root and shoot lengths, biomass, phytoavailability of phosphorus (P), chlorophyll content, H2O2 production, and micronuclei (MN) formation in the plants grown from seeds in NPs-spiked soils, were subsequently recorded. All experiments were repeated twice with four replicates per treatment. After 60 days exposure to the NPs, root and shoot lengths, and P uptake by plants was significantly (p < 0.05) higher between 20 and 60 mg kg(-1) compared to the control (0 mg kg(-1) TiO2 NPs), but was then lower at 80 and 100 mg kg(-1) compared to 60 mg kg(-1) TiO2 NPs. The application of TiO2 NPs led to chlorophyll content being higher by 32.3% at 60 mg kg(-1) than in the control, but 11.1% lower content was observed at 100 mg kg(-1). The results suggested that wheat could not tolerate concentrations of TiO2 NPs higher than 60 mg kg(-1) owing to over-production of H2O2 (84.4%) and MN formation (53.6%).</P>
Rafique, Rafia,Baek, Seung Hoon,Phan, Le Minh Tu,Chang, Sung-Jin,Gul, Anam Rana,Park, Tae Jung Elsevier S.A. 2019 Materials Science and Engineering C Vol. No.
<P><B>Abstract</B></P> <P>Using a facile hydrothermal procedure, hydrophilic NaYF<SUB>4</SUB>: Yb<SUP>3+</SUP>/Er<SUP>3+</SUP> nanoparticles (NPs) have been prepared as lanthanide-doped upconversion (UC) materials exhibiting different morphologies, crystal phases and luminescence intensity. The upconversion nanoparticles (UCNP) were characterized by means of electron microscopy and spectroscopy, X-ray diffraction (XRD) and photoluminescence analysis. The molar concentration of reactants and volumes of NaF affect the shapes and uniformity of the synthesized NPs. These parameters also have influence on crystal phase and luminescence intensity of the NPs. Adjusting hydrothermal reaction time and dopant concentration also enable the synthesis of NPs with strong UC luminescence. The as-prepared UCNP showed cellular nontoxicity to HeLa cells, and thus they are capable as promising agents for biological imaging.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fabrication of NaYF<SUB>4</SUB>:Yb<SUP>3+</SUP>/Er<SUP>3+</SUP>, upconversion nanoparticles (UCNPs) </LI> <LI> Molar concentration of NaF and reactants affects shapes and uniformity of nanoparticle. </LI> <LI> Adjusting reaction time and dopant concentration enhance UC luminescence of UCNPs. </LI> <LI> Optimized conditions are promising for <I>in vitro</I> HeLa cell imaging. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Phan, Le Minh Tu,Rafique, Rafia,Baek, Seung Hoon,Nguyen, Thang Phan,Park, Kyoung Yeol,Kim, Eun Bee,Kim, Jong Gil,Park, Jong Pil,Kailasa, Suresh Kumar,Kim, Hwa-Jung,Chung, Chaeuk,Shim, Tae Sun,Park, Ta Elsevier 2018 Biosensors & bioelectronics Vol.121 No.-
<P><B>Abstract</B></P> <P>Herein, a straightforward and highly specific dot-blot immunoassay was successfully developed for the detection of <I>Mycobacterium tuberculosis</I> antigen (10 kDa culture filtrate protein, CFP-10) <I>via</I> the formation of copper nanoshell on the gold nanoparticles (AuNPs) surface. The principle of dot-blot immunoassay was based on the reduction of Cu<SUP>2+</SUP> ion on the GBP-CFP10G2-AuNPs conjugates, which has gold binding and antigen binding affinities, simultaneously, favouring to appear red dot that can be observed with naked-eye. The dot intensity is proportional to the concentration of tuberculosis antigen CFP-10, which offers a detection limit of 7.6 pg/mL. The analytical performance of GBP-CFP10G2-AuNPs-copper nanoshell dot-blot was superior than that of conventional silver nanoshell. This method was successfully applied to identify the CFP-10 antigen in the clinical urine sample with high sensitivity, specificity, and minimized sample preparation steps. This method exhibits great application potential in the field of nanomedical science for highly reliable point-of-care detection of CFP-10 antigen in real samples to early diagnosis of tuberculosis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A specific dot-blot immunoassay to detect tuberculosis antigen CFP-10. </LI> <LI> Copper nanoshell enhancement by amplifying the signal of AuNPs on the paper strip. </LI> <LI> Signal detection with naked-eye or smartphone camera of detection limit of 8 pg/mL. </LI> <LI> Great application potential in the field of nanomedical science. </LI> </UL> </P>
Choi, Seung Yoo,Baek, Seung Hoon,Chang, Sung-Jin,Song, Yohan,Rafique, Rafia,Lee, Kang Taek,Park, Tae Jung Elsevier Applied Science 2017 Biosensors & bioelectronics Vol. No.
<P><B>Abstract</B></P> <P>Multifunctional nanocomposite has a huge potential for cell imaging, drug delivery, and improving therapeutic effect with less side effects. To date, diverse approaches have been demonstrated to endow a single nanostructure with multifunctionality. Herein, we report the synthesis and application of core-shell nanoparticles composed with upconversion nanoparticle (UCNP) as a core and a graphene oxide quantum dot (GOQD) as a shell. The UCNP was prepared and applied for imaging-guided analyses of upconversion luminescence. GOQD was prepared and employed as promising drug delivery vehicles to improve anti-tumor therapy effect in this study. Unique properties of UCNPs and GOQDs were incorporated into a single nanostructure to provide desirable functions for cell imaging and drug delivery. In addition, hypocrellin A (HA) was loaded on GOQDs for photo-dynamic therapy (PDT). HA, a commonly used chemotherapy drug and a photo-sensitizer, was conjugated with GOQD by π-π interaction and loaded on PEGylated UCNP without complicated synthetic process, which can break structure of HA. Applying these core-shell nanoparticles to MTT assay, we demonstrated that the UCNPs with GOQD shell loaded with HA could be excellent candidates as multifunctional agents for cell imaging, drug delivery and cell therapy.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of upconversion core/shell nanoparticles (UCNPs). </LI> <LI> Hypocrellin A (HA) conjugated with graphene oxide quantum dots (GOQDs) and UCNPs. </LI> <LI> Photodynamic effects of HA/GOQDs/UCNPs by cellular uptake and singlet oxygen. </LI> <LI> Treatment to kill cancer cells using light active and biocompatible nanocomplex. </LI> </UL> </P>
Phan, Le Minh Tu,Baek, Seung Hoon,Nguyen, Thang Phan,Park, Kyoung Yeol,Ha, Siyoung,Rafique, Rafia,Kailasa, Suresh Kumar,Park, Tae Jung Elsevier 2018 Materials science & engineering. C, Materials for Vol.93 No.-
<P><B>Abstract</B></P> <P>A facile one-step synthetic approach was developed for fabrication of fluorescent silicon quantum dots (Si QDs) and used as a probe for fluorescence detection of hexavalent chromium (Cr (VI)) in environmental water samples. The as-prepared Si QDs exhibit a strong fluorescence emission peak at 520 nm with a quantum yield of 14.2%. The fluorescent Si QDs were rapidly produced by using ascorbic acid as a reductant at 55 °C. The emission peak of Si QDs at 420 nm was effectively quenched upon the addition of Cr(VI). The Si QDs acted as the best fluorescent probe for the detection of Cr(VI) at PBS pH 7.4. The developed probe possessed a good linear correlation (R<SUP>2</SUP> = 0.992) between Cr(VI) concentration (1.25–40 μM) and the (F<SUB>0</SUB>-F)/F<SUB>0</SUB> values with a detection limit of 0.65 μM. Furthermore, the Si QDs served as a bio-probe for fluorescence imaging of A549 lung cancer cells and cell viability results confirmed the good biocompatible nature of Si QDs. The as-fabricated Si QDs show several advantages such as rapidity, selectivity and biocompatibility for sensing of Cr(VI) and imaging of A549 cells, which opens a facile analytical platform for environmental and bioimaging applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Facile one-step hydrothermal method for synthesis of fluorescent Si QDs </LI> <LI> A rapid probe was developed for analysis of Cr(VI) without any sample preparations. </LI> <LI> The detection limit of Cr(VI) was estimated to be 0.65 μM. </LI> <LI> The method exhibited good selectivity and sensitivity for assay of Cr(VI). </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>